I am sorry that the answer you got before was misleading - it was generated by an AI that has no understanding of your question or Atlassian software.
I am not sure I understand the question, so I will paraphrase it so that you can see my thinking.
- You have a CSV file with a load of attachments you want to import into Jira, into different existing issues.
- The CSV does not have the existing issues keys for the attachments to go to, or has a different issue key for them.
In this case, the answer is simple. You can not import data that you do not have (in this case, the data that "attachment X should be attached to issue Y")
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